FNUS75 KRIW 151544
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE RX...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
944 AM MDT TUE SEP 15 2009

FORECAST IS BASED ON IGNITION TIME OF 0925 MDT ON SEPTEMBER 15.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
THE SOUTHEASTERLY FLOW BETWEEN AN UPPER LOW OVER SOUTHERN UTAH
AND HIGH PRESSURE OVER WESTERN SOUTH DAKOTA WILL CONTINUE TO PUMP
MOISTURE INTO CENTRAL AND WESTERN WYOMING THROUGH THIS EVENING. A
GOOD CHANCE FOR WETTING RAINS IS POSSIBLE THIS AFTERNOON AND EARLY
EVENING AS A LARGE ORGANIZED AREA OF SHOWERS AND THUNDERSTORMS
MOVES THROUGH THE BURN AREA. ISOLATED SHOWERS AND THUNDERSTORMS
WILL CONTINUE THIS EVENING BEFORE ENDING AFTER ABOUT MIDNIGHT.
A DRYING TREND UNDER STRONG HIGH PRESSURE IS EXPECTED FOR
WEDNESDAY AND THURSDAY.

...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS...
...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT...

FORECASTER...CHURCH

.TODAY...
SKY/WEATHER.........CLOUDY (85-95 PERCENT). ISOLATED SHOWERS
                    IN THE MORNING. SCATTERED TO NUMEROUS SHOWERS
                    AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....55-58.
MIN HUMIDITY........60-64 PERCENT.
20 FOOT WINDS.......EAST 3-7 MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS.
RIDGE TOP WINDS.....EAST 10 TO 15 MPH.
LAL.................2 UNTIL 1200...THEN 4.
CHC OF WETTING RAIN.60 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3600 FT AGL INCREASING TO 6200 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....EAST 10 TO 17 MPH.
SMOKE DISPERSAL.....POOR (22700 KNOT-FT) INCREASING TO GOOD (81500 KNOT-FT)
                    IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). ISOLATED
                    SHOWERS AND THUNDERSTORMS IN THE EVENING.
MIN TEMPERATURE.....44-48.
MAX HUMIDITY........92-96 PERCENT.
20 FOOT WINDS.......EAST 2 TO 5 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    EVENING.
RIDGE TOP WINDS.....EAST-SOUTHEAST 10 TO 15 MPH.
LAL.................2 UNTIL 2400...THEN 1.
CHC OF WETTING RAIN.15 PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3700 FT AGL DECREASING TO 600 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....EAST-SOUTHEAST 10 TO 15 MPH.
SMOKE DISPERSAL.....POOR (5900-36900 KNOT-FT).

.WEDNESDAY...
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). SLIGHT CHANCE FOR AN
                    ISOLATED THUNDERSTORM IN THE AFTERNOON.
MAX TEMPERATURE.....65-68.
MIN HUMIDITY........34-37 PERCENT.
20 FOOT WINDS.......SOUTHEAST 2 TO 5 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....SOUTHEAST 10 TO 15 MPH.
LAL.................1 UNTIL 1200...THEN 2.
CHC OF WETTING RAIN.LESS THAN 5 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2400 FT AGL INCREASING TO 8100 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST 10 TO 15 MPH.
SMOKE DISPERSAL.....FAIR (40700 KNOT-FT) INCREASING TO GOOD (95500
                    KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY. LOWS IN THE MID 40S. HIGHS IN THE LOWER 60S. WINDS
GENERALLY LESS THAN 10 MPH.
.FRIDAY...PARTLY CLOUDY. LOWS IN THE MID 40S. HIGHS AROUND 60.
WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...PARTLY CLOUDY. LOWS IN THE UPPER 40S. HIGHS IN THE
LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...CHURCH
REQUESTED BY...MCFARLAND
REASON FOR REQUEST...PRESCRIBED
.TAG 20090915.LOWER.01/RIW